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WASHINGTON — The United States, Britain and Canada announced fresh plans Monday to sanction Iran's financial and energy sectors, steps analysts said would raise pressure on Tehran but were unlikely to halt its atomic program.

The United States named Iran as an area of "primary money laundering concern," a step designed to isolate its banking sector; blacklisted 11 entities and individuals suspected of aiding its nuclear programs; and expanded sanctions to target companies that help develop its oil and petrochemical industries.

The United States stopped short, however, of targeting Iran's central bank, a step that could have cut it off from the global financial system, sent oil prices skyrocketing and jeopardized U.S. and European economic recovery.

Russia dismissed the new sanctions as "unacceptable" on Tuesday and said they would hurt the chances of renewing talks with Tehran over its nuclear program.

A sharply worded Russian statement underscored Moscow's longstanding opposition to sanctions beyond those endorsed by the United Nations Security Council, where Russia holds veto power as a permanent member.

"We again underline that the Russian Federation considers such extraterritorial measures unacceptable and contradictory to international law," Foreign Ministry spokesman Alexander Lukashevich said.

It indicated that despite agreement last week on a U.N. nuclear agency board resolution that expressed increasing concern about Iran's nuclear program, Russia differs sharply with the West on how to win Tehran's cooperation.

The range of unilateral steps planned by Western powers reflects the difficulty of persuading Russia and China not to veto further measures at the U.N. Security Council, where they have supported four previous sanctions resolutions.

British ban
Britain on Monday banned dealings with Iranian banks including the central bank and France called for measures on an "unprecedented scale" over Tehran's nuclear program.

Canada said it would ban the export of all goods used in Iran's petrochemical, oil and gas industry and "block virtually all transactions with Iran," including with its central bank, with an exception for Iranian-Canadians to send money home.

The steps come in response to a Nov. 8 report by the International Atomic Energy Agency that presented intelligence suggesting Iran had worked on designing an atomic bomb and may still be secretly carrying out related research. Iran says its nuclear work is entirely peaceful.

In a statement, President Barack Obama said that as long as Iran continues down a dangerous path with its nuclear program, the United States will continue to find ways to isolate and increase the pressure on Tehran.

Obama says Iran's actions jeopardize international peace and stability. Still, he says the U.S. is still prepared to start a new chapter with Iran if it fulfills its international obligations. But if it continues to defy its responsibilities, he says Iran faces even more pressure.

Analysts said they did not believe the steps would change the Iranian calculation on its nuclear program, which Washington and its allies suspect is a cover for seeking nuclear arms.

"Is this the straw that will break the camel's back? No," said George Perkovich, director of the Nuclear Policy Program at the Carnegie Endowment for International Peace, a Washington think tank.

"The administration is testing the proposition as to whether there is a point at which the sanctions can lead the Iranians to a tipping point, recognizing that the likelihood is low," said Rob Danin of the Council on Foreign Relations.

While Britain ordered its financial institutions to stop all business with Iran, a source familiar with the sanctions said the steps would not directly target trade in Iranian oil.

"We believe that the Iranian regime's actions pose a significant threat to the UK's national security and the international community. Today's announcement is a further step to preventing the Iranian regime from acquiring nuclear weapons," said British finance minister George Osborne.

The U.S. decision to name Iran as a money laundering concern has no direct effect — U.S. banks are already barred from transactions with Iranian financial institutions — and seemed more a warning about the risks of dealing with Iran.

'Isolation'
EU governments could reach a preliminary deal on Tuesday to add about 190 Iranian people and entities to a list of those targeted by asset freezes and travel bans, diplomats said.

But France called for much stronger action.

"As Iran steps up its nuclear program, refuses negotiation and condemns its people to isolation, France advocates new sanctions on an unprecedented scale to convince Iran that it must negotiate," said a statement from President Nicolas Sarkozy's office.

"France therefore proposes to the European Union and its member states, the United States, Japan and Canada and other willing countries to take the decision to immediately freeze the assets of the Iranian central bank (and) stop purchases of Iranian oil," it added.

The new EU measures will likely target industries such as shipping and will be formalized at a meeting of EU foreign ministers on Dec. 1, but discussions on possible further steps could take place in the coming days, diplomats said.